<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Promise-catch方法</title>
</head>

<body>
  <script>
    const p = new Promise((resolve, reject) => {
      setTimeout(() => {
        reject("出错啦")
      }, 1000)
    });

    /* 
    p.then(function() {}, function(reason) {
      console.log(reason)
    }) 
    */

    p.catch(err => {
      console.warn(err)
    })
  </script>
</body>

</html>